There were Three Little Trash Cans. They all lived in one house. One day, there was a garbage truck, and it came to their house. " Tap Tap"." Who is it? " " It is I, the garbage truck, let me come in. " How did the Trash Cans reply?
"Not by the smell of the lids on our bins!"
Cái gì mà đi thì nằm, đứng cũng nằm, nhưng nằm lại đứng?